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The Axxess GMOS-LAN-03 wiring interface lets you replace the factory radio in select OnStar-equipped 2006-up GM vehicles using the existing wiring and connectors. Even if you don't subscribe to OnStar, you'll need this interface to connect an aftermarket stereo.

Connect the GMOS-LAN-03 to your aftermarket radio, mount the module, and plug it into the existing factory plug. Get the great sound you want, and keep all of the important safety features intact.

You can adjust volume settings for OnStar as well as the safety chimes. In addition, this interface lets your new receiver work with any existing factory amplifiers. This interface gives you convenient plug-in connections for the Axxess steering wheel control adapter (not included) that works with most aftermarket stereos – that means less wiring work for you. This interface even includes a relay that enables you to keep the audible "click" for your vehicle's turn signal.

The Axxess GMOS-LAN-03 is compatible with select 2006-and up General Motors vehicles. If you haven't done so already, please enter your vehicle information or call a Sales Advisor at 1-888-955-6000 to find out if this item is compatible with your vehicle. Warranty: 1 year.

Note: Most vehicles will require additional installation parts  please identify your vehicle if you haven’t done so, then check here for a list of parts. You can also call an Advisor for more information.

Hands-on research

What's in the box?

Product Research

Features

Overview: The GMOS-LAN-03
Interface is designed to retain the ONSTAR emergency services function and retain the warning chimes that are
normally lost when the factory radio is removed and replaced by an aftermarket
head unit. It also provides a 12-volt accessory output for proper aftermarket
head unit operation and supports your vehicle's factory R.A.P. (Retained
Accessory Power). In addition, the GMOS-LAN-03 also provides a Mute, Parking
Brake, VSS or Speed Sense, and a Reverse Output to make installation of an
aftermarket navigational head unit simpler and less time consuming. The
GMOS-LAN-03 supports the Axxess Steering Wheel Control Interface (sold
separately).

Compatibility: The GMOS-LAN-03
is compatible with the following Chevrolet, Pontiac and Saturn vehicles.

Connections: The GMOS-LAN-03
consists of a single interface with a 16-pin connector on one of the module and
and 18-pin connector on the other end; plus includes
two harnesses. One harness includes a
16-pin plug that plugs into the 16-pin connection on the interface (beside potentionmeter) and its bare
lead wires are hardwired into your new radio's harness. The other harness also
includes a 18-pin plug that plugs into the other 18-pin connection of the interface
and includes bare wires that hardwire into your new aftermarket radio's harness
and GM factory plugs that plug into the factory side plugs behind the radio.

Chime Volume Adjustment: The
GMOS-LAN-03 interface features potentiometer located on the 10 pin harness of
the module, to adjust the chime volume of your vehicle. Rotate clockwise to make
the chime louder and counterclockwise to make the chime softer.

Navigation Compatible: The GMOS-LAN-03 also provides Mute,
Parking Brake, VSS or Speed Sense, and a Reverse Output to make installing an
aftermarket Navigation radio simpler and less time consuming.

Retained Accessory Power (R.A.P.): The ignition power source
of most GM vehicles keeps the radio on until one of the doors is opened. This
feature is called the R.A.P. (retained accessory power). The GMOS-LAN-03 is
designed to retain this feature.

Note: Your vehicle must have factory steering wheel
controls to retain access to the factory customization menu, once the
factory radio is replaced with an aftermarket head unit.

Optional RSE Retention Harness: The Metra GMRSAV (120GMRSAV,
sold separately) is an RSE retention harness designed to retain the rear seat
entertainment system in these select GM vehicles. The GMRSAV provides an
audio/video input to the factory overhead video screen from your new aftermarket
radio, and provides the audio/video output from the rear seat control panel to
the aftermarket head unit.

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Read the fine print

The one good thing about this unit is getting it for half price when I bought my Pioneer head unit. Thank you Crutchfield for that. Then I learned you really got read the description better. When purchasing my head unit it said this is required to retain On-Star, warning chimes and steering wheel controls. But, what I didn't notice was you have to buy yet another adapter that connects to this adapter for the the steering wheel controls to work and it was expensive!! That price is outrageous! The second problem I have is the warning chimes. The chimes use the driver side door speaker and cuts out the audio of my music when I'm listening to it. I had the installer check all the connections to make sure there wasn't a short and all the connections are solid. So, this is the only thing we could fault the audio cutting out to. Not much more to say since this is pretty much something you have to buy when upgrading the head unit.

2010 HHR

Installed in my 2010 Chevrolet HHR with a Kenwood DPX500BT. All my chimes work, including turn signals. I don't have OnStar or steering wheel controls for audio, so no worries there. My first stereo install in over 10 years. Couldn't have been easier.

GMOS Simple

The GMOS-LAN-03 Makes short work when installing a new head unit into your ride.The Crutchfield crew sent me all the info on how to install this integration adapter and it works perfect. Integrate your new head unit wiring harness with the GMOS-LAN-03 and then straight into your factory wiring harness and your done.

Pros:Simple directions, easy hook-up

Cons:A little bulky....I had to do some relieve cutting behind the head unit in order to have a place to put all that wire

Axxess GMOS-LAN-03 Wiring Interface

It has been several years since I have installed a car stereo, but this by all means possibly the most confusing adapter I have ever dealt with for any piece of electronics. There is no way to wire up everything and keep the wires from being a jumbled up mess.

Axxess GMOS-LAN-03

Instructions are a bit confusing at first but after reviewing several times I was able to figure it out. There was a wiring problem on the prewired harness that came with this interface for the ASWC (steering wheel controls) but with the help of technical support they figured out the problem and helped me rewire it correctly. I'm still having some issues with remapping the buttons but I'm sure another conversation with tech support will resolve that issue also.

Pros:Was able to maintain functionality of original equipment.

Cons:Could be very challenging without tech support to assist with the installation.

GM Interface Module

The interface module works great. I have a 2008 Chevy HHR and I needed this to replace the failing stock stereo and it works fine. I don't have any steering wheel remote functions with this car so I am not sure how that aspect works.

Pros:Adjustable timer for auto power off. Everything appears to be functioning fine so far.

Cons:Setting the volume for the dinging/beeping function for if you leave your lights on or keys in the ignition could be made easier. Instructions could have been clearer, but I did figure it out.

GMOS-LAN-03 in a 2006 Solstice

Still installing due to poor documentation.... Manual is incomplete as multiple wires are stated in text but not indicated in wiring diagram / schematic. Crutchfield must be aware of this, but states "this is not their product, so they do not maintain documentation".

As en Electrical Engineer, I want to make sure everything is correct and safe. Hard to do with incomplete instructions.

Worked Fine

Used to installed Alpine CDE-133BT in 2010 Chevy Malibu with no problems. Came with relay for turn signal blinker noise so have retained all original sounds (chimes and blinker). Car does not have Onstar or Steering wheel controls so can't comment on these. Had two wiring questions and called Crutchfield support and got quick answers. The outfit is big and bulky but fit fine. Got for 1/2 price ($65) with purchase of the Alpine.

Pros:It works and support was great. Price (when purchased with stereo) is great and also got a free dash kit.

Cons:Installation instructions are good, but I needed a detailed video (I searched YouTube) since I had never removed a factory radio before (minor point).

Axxess GMOS-LAN-03 Wiring Interface

Bought this to integrate JVC KDR-730BT into a 2010 HHR. Works pretty much as advertised, except for dimmer; wired up as instructed but not working correctly. No OnStar in vehicle so not tested. All chimes work plus mine came with the SPST relay for blinker. It works but with radio turned up you cant hear it.

Good priduct. Not what i expected.

I bought this with my head unit because i was hoping to get my warning chimes back. I get the thing all hooked up and the only thing i get is a turn signal. Could care less. I just want the chime that tells me to turn off my lights. But after working with crutchfield and metra i come to find out i need another speaker or to run it to my aftermarket amp. If you are running the stock speakers this will basically be plug and play. But if you have aftermarket amps like me you will find this to be a little more frustrating then first intended. The Lan Bus itself dosnt have a speaker so you have to either wire it to your amp (which in my case wont help me from leaving my lights on, when the head unit shuts off, my amps turn off) or buy a speaker for it.

Pros:Made it super easy to hook up to my car. Didnt have to cut any wires.

Cons:I still have no chimes for anything. Im not running a wire back to my amp to hook up chimes. And i dont know if im going to buy the speaker or not. But for now i wont have any chimes. Anybody with an aftermarket amps, make sure you look into a lan bus with a speaker on the bus itself. Yes you will pay a little more but it will save you the hassle of what i am going through.

Mostly works

1. No provision to give turn signal clicking sound (this function was integrated into the factory radio.) Turn signals will operate silently unless you source your own part for it, and even then it's a hack that uses the clicking sound of a mechanical relay. 2. Inadequate manual. 3. Preposterously large in physical size. 4. Volume adjuster for door chime only acts over a tiny portion of the adjustment range. 5. Overall: pretty junky.

Update: 4.7.2014 - Bulky and unreliable. Deserves no place in my dashboard. If I buy and install it, I don't want to ever have to rip into my dashboard again for troubleshooting or replacement.

Bulky. Case: 3.4 x 2.9 x 1.3 inches. The wire connectors protrude from the 3.4" dimension, requiring an additional inch or so on each end, to avoid racking the connectors or bending the wires too much.

Gets you by but quality and functions lacking

This adapter will give you the ding sound you need but for some reason will not sound when the turn signal is used (instructions tell you to hook up a dummy relay that will make a clicking sound). For the money you pay I expect to get full function sounds not a work around. Also the plugs are poor quality and I had to hot glue them to get them to stay in place.

OnStar and turn signal survived

Used this interface for my 09 Aura, and overall I'm pretty happy. The wiring diagram lied to me though, as there are three possible dimmer wires to use and the ones the manual suggested are not hooked up to anything on my wiring harness. I used the orange/white that comes from the interface box itself and that worked, so the product loses one star there. I used a relay for turn signal, works as advertised. If you have a newer GM car, this is a great investment to keep all your factory features working!

Axxess GMOS-LAN-03 Wiring Interface

I used this successfully in a 2007 Saturn Aura. I do not know if the OnStar
still works after the install because I never tested it. I believe that the
Orange/White dimmer wire from the unit is actually orange/blue. This is
what I used with the dimmer on a Kenwood reciever. After hooking it up, I
had no radio reception as if the antennae was not connected. Crutchfield
tech support suggested connecting one of the wires (don't remember which
one) from the unit to the remote from the reciever and the antennae
works. The turn signal audible "clicking" no longer works but there are
instructions to add a relay which I did not do.